Use the category context strategy to get more context (what project or category a task belongs to) for a task in your day view.

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Without this strategy enabled a task in Marvin looks something like this:

Turning on the category context strategy (☰ → Strategies → Category Context) enables you to see a task with some added context of where the tasks belong in your Master List. 

You can choose in the settings (click on the strategy card then on the settings button) how the context should be displayed.
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You can choose to see the immediate parent as text underneath the title, have an additional colored corner or big square on the left, to have a dot right from the title, or to have the background colored. Or you can choose to display them without the text.

The color for the corner, square, or other color indicator is the color you picked for the parent category/project in the Master List.

Hovering over the indicator, in this case the corner, will show you the name of the parent category/project. 

Clicking on the corner, or the text on the right will open the task's parent in the full-screen view.

If that doesn't happen, please make sure that "Open fullscreen on click" settings are checked.